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CVE-2026-39410

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-39410

Severity

4.8

Medium

CVSS V3

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Summary

Hono has a non-breaking space prefix bypass in cookie name handling in getCookie()

Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a discrepancy between browser cookie parsing and parse() handling allows cookie prefix protections to be bypassed. Cookie names that are treated as distinct by the browser may be normalized to the same key by parse(), allowing attacker-controlled cookies to override legitimate ones. This vulnerability is fixed in 4.12.12.

References

Affected packages


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